Bondi accretion theory
E1017418
Bondi accretion theory is a model in astrophysics that describes how matter spherically accretes onto a compact object under the influence of its gravity from a surrounding gas cloud.
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical accretion model
ⓘ
theoretical model ⓘ |
| alsoKnownAs | Bondi spherical accretion model NERFINISHED ⓘ |
| appliesTo |
black holes
ⓘ
compact objects ⓘ neutron stars ⓘ stars moving slowly relative to ambient gas ⓘ white dwarfs ⓘ |
| assumes |
Newtonian gravity
NERFINISHED
ⓘ
adiabatic or polytropic equation of state ⓘ no magnetic fields ⓘ no radiative feedback on the flow ⓘ non-rotating gas ⓘ spherical symmetry ⓘ steady-state flow ⓘ |
| basedOn | hydrodynamic equations for compressible flow ⓘ |
| context | spherically symmetric accretion ⓘ |
| defines | Bondi radius as characteristic gravitational capture radius ⓘ |
| dependsOn |
density of the ambient gas
ⓘ
mass of the accreting object ⓘ sound speed in the ambient gas ⓘ |
| describes |
accretion from a surrounding gas cloud under gravity
ⓘ
spherical accretion of matter onto a compact object ⓘ |
| developedBy | Hermann Bondi NERFINISHED ⓘ |
| field | astrophysics ⓘ |
| generalizedBy | Bondi–Hoyle–Lyttleton accretion theory NERFINISHED ⓘ |
| influenced |
accretion prescriptions in numerical simulations
ⓘ
subsequent models of black hole growth in galaxies ⓘ |
| limitation |
assumes uniform ambient medium at infinity
ⓘ
neglects angular momentum of the inflowing gas ⓘ neglects detailed radiative transfer ⓘ neglects magnetic fields ⓘ |
| mathematicallyCharacterizedBy | critical point where flow speed equals sound speed ⓘ |
| namedAfter | Hermann Bondi NERFINISHED ⓘ |
| predicts |
Bondi accretion rate
NERFINISHED
ⓘ
existence of a sonic radius in the flow ⓘ radial profiles of density and velocity ⓘ |
| publicationYear | 1952 ⓘ |
| publishedIn | Monthly Notices of the Royal Astronomical Society NERFINISHED ⓘ |
| relatedTo | Bondi radius NERFINISHED ⓘ |
| usedFor |
estimating gas accretion rates onto black holes in galaxies
ⓘ
modeling accretion in X-ray binaries in simplified form ⓘ order-of-magnitude estimates in cosmological simulations ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.